There is this bioinformatics wiki by the 'Bioinformatics Organization', but its largely reference material. I was thinking of creating a wiki with reference material that also includes examples, tutorials, scripts, and other resources for learning.

I use them interchangeably, but there seems to be a slight difference. Here's what the Cornell Department of Biostatistics and Computational Biology says:

The terms computational biology and bioinformatics are often used interchangeably. However, computational biology sometimes connotes the development of algorithms, mathematical models, and methods for statistical inference, while bioinformatics is more associated with the development of software tools, databases, and visualization methods. Source

Another perspective:

Computational biology = the study of biology using computational techniques. The goal is to learn new biology, knowledge about living sytems. It is about science.

Bioinformatics = the creation of tools (algorithms, databases) that solve problems. The goal is to build useful tools that work on biological data. It is about engineering. Source

I like this definition more than Cornell's; since comp bio is a field of biology, then it would make sense that it would have to deal with approaching biological problems with computational tools. Bioinformatics is about developing those tools.

There is currently a project on Wikipedia to improve the Bioinformatics/Computational Biology, which I think is a win for all since it's well known and easily accessible. The Bioinformatics Organization's wiki is nice, but needing to be an approved and registered user is a huge barrier to providing more (and more up-to-date) information.